<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
      <span>已完成{{ doneCount }}</span> / 全部{{ total }}
    </span>
    <button class="btn btn-danger" @click="clear">清除已完成任务</button>
  </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Footer",
});
</script>

<script setup lang="ts">
import type { Todo } from "@/App.vue";
import { computed } from "vue";
const props = defineProps<{
  todos: Todo[];
  checkAll(done: boolean): void;
  clearAllDone(): void;
}>();

// 总数
const total = computed(() => {
  return props.todos.length;
});

//已完成
const doneCount = computed(() => {
  return props.todos.reduce((pre, item) => pre + (item.done ? 1 : 0), 0);
});

const isAll = computed({
  get() {
    return props.todos.every((item) => item.done);
  },
  set(val) {
    props.checkAll(val);
  },
});

const clear = () => {
  props.clearAllDone();
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
